21669116 has 12 divisors (see below), whose sum is σ = 43338288. Its totient is φ = 9286752.

The previous prime is 21669113. The next prime is 21669143. The reversal of 21669116 is 61196612.

21669116 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21669113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386921 + ... + 386976.

It is an arithmetic number, because the mean of its divisors is an integer number (3611524).

Almost surely, 2^21669116 is an apocalyptic number.

It is an amenable number.

21669116 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21669116 is a wasteful number, since it uses less digits than its factorization.

21669116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773908 (or 773906 counting only the distinct ones).

The product of its digits is 3888, while the sum is 32.

The square root of 21669116 is about 4655.0097744258. The cubic root of 21669116 is about 278.7920582439.

The spelling of 21669116 in words is "twenty-one million, six hundred sixty-nine thousand, one hundred sixteen".